<section>
    <header style="position: fixed; z-index: 9999; background: rgba(28, 54, 85, 0.9);">
        <div class="wrapper">
            <a href="#"><img src="img/logo.png" class="logo" alt="" titl=""/></a>
            <nav>
                <a href="{$base}index.php?c=login&m=acesso" class="login_btn">Entrar</a>
            </nav>
        </div>
    </header>
</section>